These large finderscope/photoguide telescope mounting rings mount a
short focal length refractor optical tube or a small catadioptric
telescope on an optional Losmandy D-series or Vixen-style dovetail plate. They let you
use the second scope as a high power/variable power finderscope for your
larger telescope; as a photoguide scope for long exposure deep sky
photography; and as an astrograph. The rings are sold as a pair only.

They have a nominal 160mm (6.3”) internal diameter and will hold
optical tubes with an o. d. of 5” to 6.3”. Optical tubes with the latter
tube o.d. are a tight fit and allow for very little collimation range. A
5.75” i.d would be a more reasonable maximum size There are three large
hand-tighten adjustment screws with non-marring Delrin tips in each
ring. These allow you to collimate the refractor with the main scope
optics when it is used as a finderscope, or to aim the refractor
off-axis to locate an appropriate guide star or photographic target when
it is used as a photoguide or astrograph.

The black-anodized rings weigh 3.5 pounds per set. The height from
the top of a Losmandy D-series dovetail plate to the center of the rings is 5.1”. With a Vixen-style dovetail, the height is 4.8". They
mount on each dovetail plate with no tools required.

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We’ll do our best to meet or beat that price and will get back to you within one business day with our best offer. Thanks for giving us the opportunity to give you a better deal.

Clear skies,
Astronomics

These Losmandy rings mount a refractor or a catadioptric telescope up to
6” in diameter on an optional Losmandy or Vixen-style dovetail plate for use as a
finderscope, photoguide, or astrograph . . .